Keep a mileage log

Evernote is a cross-platform, freemium app designed for note taking, organizing, and archiving. Turn on Applets to sync and save the information you care about to your notebooks — automatically and quickly.
The iPhone's Health app consolidates health data from iPhone, Apple Watch, Apple Health, and other apps so you can track your progress in one convenient place. This service requires the IFTTT app for iOS.